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5 people were asked about the time in a week they spend doing social work in the community. They said 10, 7, 13, 20, and 15 hours, respectively. Find the mean for the average time in a week devoted by them to social work.
Find the percentage of pupils whose favourite colour was red from the given graph.
A letter of English alphabet is chosen at random. Find the probability that, the letter chosen is a vowel.
Three coins are tossed together. What are the total number of possible outcomes?
A box contains 19 cards having numbers 1, 2, 3, .... 19. A card is drawn from the box. What is the probability that the number on the card is divisible by 5?
A card is drawn from a pack of 52 cards. Find the probability of drawing a red face card.
A dice is thrown once. What is the probability of getting a multiple of 3?
Out of 400 bulbs in a box, 15 bulbs are defective. One bulb is taken at random from the box. Find the probability that the bulb is not defective.
A bag contains 9 red, 7 white and 4 black balls. A ball is drawn at random. Find the probability that the ball drawn is not red.
Find the probability of getting an even number between 10 to 25.